This is a mint condition pair of wide field eyepieces with the 30mm diameter sleeve. They were manufactured by Bausch & Lomb just before the merger with Cambridge Instruments. The B&L logo has been rebranded with a Cambridge Instruments foil. These oculars fit the SZ-6 Plus stereo zoom microscopes. They have a 20mm field-of-view index (the observable field diameter equals 20mm when the zoom setting is at 1x).

The eyepieces are in superb condition without any flaws. Catalog number is 31-15-77..